As with human medicine, the on-site capacity to look at DNA and RNA reinvents veterinary practice. As mentioned for MRSA, infected animals may also be vectors for the spread of other diseases to humans. These include Anthrax, Plague, Salmonellosis, Shigellosis, Streptococcosis, Tularemia, Rabies and Rift Valley Fever. Their presence makes on-site veterinary testing even more desirable. More than 69 million American households have at least one dog or cat, and there are about 60,000 veterinarians in the United States. Most vets want cutting-edge, in-house diagnostic capabilities. To them, on-site PCR testing would mean more profit, since money currently being paid to outside service providers for diagnosing companion animal diseases would instead be kept in-house.